This bike wont have any "original" components -- it was likely sold as a frameset.

Any complete Campy or Dura Ace/ 600 tri color/ Suntour Superbe Pro group would be "correct"

Those mono-planer brakes were on Athena , Chorus, or Record groups in that time period and the headset and crank does not look entry level

You get a period correct Athena/Chorus/Record rear derailleur and hubs with a set of nice tubulars built up on them , plus bars and stem from Cinelli/ITM/3T , and you have something special ---

Love the paint scheme -- its a beautiful bike !